On 10/30/2022 12:34 PM, Paul B Mahol wrote:
+static const struct {
+ const int order;
+ const int inputs;
+ const int speakers;
+ const int near_field;
+ const int type;
+ const double xover;
+ const AVChannelLayout outlayout;
+ const double *speakers_azimuth;
+ const double *speakers_elevation;
+ const double *speakers_distance;
+} ambisonic_tab[] = {
+ [MONO] = {
+ .order = 0,
+ .inputs = 1,
+ .speakers = 1,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO,
+ .speakers_azimuth = (const double[1]){ 0. },
+ .speakers_distance = (const double[1]){ 1. },
+ },
+ [STEREO] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 2,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO,
+ .speakers_azimuth = (const double[2]){ -30, 30},
+ .speakers_distance = same_distance,
+ },
+ [STEREO_DOWNMIX] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 2,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO_DOWNMIX,
+ .speakers_azimuth = (const double[2]){ -90, 90 },
+ .speakers_distance = same_distance,
+ },
+ [SURROUND] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 3,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_SURROUND,
+ .speakers_azimuth = (const double[3]){ -45, 45, 0 },
+ .speakers_distance = same_distance,
+ },
+ [L2_1] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 3,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_2_1,
+ .speakers_azimuth = (const double[3]){ -45, 45, 180 },
+ .speakers_distance = same_distance,
+ },
+ [TRIANGLE] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 3,
+ .type = 1,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_SURROUND,
Given the angles below, this should be FC+BL+BR.
+ .speakers_azimuth = (const double[3]){ -120, 120, 0 },
+ .speakers_distance = same_distance,
+ },
+ [QUAD] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 4,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD,
+ .speakers_azimuth = (const double[4]){ -45, 45, -135, 135 },
+ .speakers_distance = same_distance,
+ },
+ [SQUARE] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 4,
+ .type = 1,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_4POINT0,
+ .speakers_azimuth = (const double[4]){ 0, -90, 180, 90 },
Probably FC+BC+SL+SR.
+ .speakers_distance = same_distance,
+ },
+ [L4_0] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 4,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_4POINT0,
+ .speakers_azimuth = (const double[4]){ -30, 30, 0, 180 },
+ .speakers_distance = same_distance,
+ },
+ [L5_0] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 5,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT0_BACK,
+ .speakers_azimuth = (const double[5]){ -30, 30, 0, -145, 145 },
+ .speakers_distance = same_distance,
+ },
+ [L5_0_SIDE] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 5,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT0,
+ .speakers_azimuth = (const double[5]){ -30, 30, 0, -110, 110 },
+ .speakers_distance = same_distance,
+ },
+ [L6_0] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 6,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_6POINT0,
+ .speakers_azimuth = (const double[6]){ -30, 30, 0, 180, -110, 110 },
+ .speakers_distance = same_distance,
+ },
+ [L7_0] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 7,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_7POINT0,
+ .speakers_azimuth = (const double[7]){ -30, 30, 0, -145, 145, -110,
110 },
+ .speakers_distance = same_distance,
+ },
+ [TETRA] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 4,
+ .type = 2,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD,
+ .speakers_azimuth = (const double[4]){ -90, 90, 0, 180 },
Either SL+SR+TFC+TBC or FC+BC+TSL+TSR, depending on which channels are
at the top.
+ .speakers_elevation = (const double[4]){ -35.3, -35.3, 35.3, 35.3 },
+ .speakers_distance = same_distance,
+ },
+ [CUBE] = {
+ .order = 1,
+ .inputs = 4,
+ .speakers = 8,
+ .type = 2,
+ .near_field = NF_NONE,
+ .xover = 0.,
+ .outlayout = (AVChannelLayout)AV_CHANNEL_LAYOUT_7POINT1,
+ .speakers_azimuth = cube_azimuth,
+ .speakers_elevation = cube_elevation,
+ .speakers_distance = same_distance,
+ },
+};
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